Hagrin.com

Tenable Security released a new version of their industry leading vulnerability scanner - Nessus. However, this version has one major change over previous versions - it is now closed source. This move was made because no developers were contributing code when Nessus was open source and yet people were repackaging the software (not always a bad thing) for their own monetary profit.

Ok, enough politics. Nessus 3.0 offers greatly increased efficiency and speed with their new version. Anyone who's doing a network security audit should know Nessus and be using it as one of their primary tools.